The 2020 BMW 5 Series displays a Driving Assistant system fault when the ADAS electronics detect a problem requiring attention. This fault message is more serious than simple feature unavailability—it indicates an actual system issue.
What System Fault Means
A Driving Assistant system fault indicates detected hardware or software problems within the ADAS. Unlike unavailable status from conditions, a fault means something is wrong with the system itself. Multiple features may be affected depending on what's failed.
Common Fault Causes
Several issues cause Driving Assistant system faults. Camera hardware failures prevent feature operation. Radar sensor faults affect distance-based features. Module communication errors interrupt system coordination. Calibration loss from windshield work causes faults. Software corruption occasionally requires updates.
Affected Features
Depending on the specific fault, various features may be impacted. Lane Departure Warning, Adaptive Cruise Control, Forward Collision Warning, and other camera or radar-dependent features may all be affected by a single sensor fault.
Diagnosis Requirements
System faults require professional diagnosis. BMW's ISTA diagnostic system reads specific fault codes identifying which component has failed. This information guides repair—camera replacement, radar service, module programming, or calibration as needed.